使用者介面大作業，選擇時區時將地圖上該時區顯示在圖片中間。

就是這樣，地圖是720*180的，含有兩個世界地圖，足夠剪裁出時區在中間的360*180圖，所以pictureBox是360*180的。
這是複製剪裁圖片的函式，

private void Clone_map(/*PaintEventArgs e,*/int X)
        {
            Bitmap myBitmap = new Bitmap("D:/C#Projects/8-image/timezone_map.GIF");//myBitmap複製過來

//之前這裡寫的是<span style="font-family: Arial, Helvetica, sans-serif;">Bitmap myBitmap = new Bitmap(pictureBox_map.Image);結果只能剪裁一次，再選擇時區時就記憶體不足，是cloneRect超出原圖範圍，</span>
 

<span style="font-family: Arial, Helvetica, sans-serif;">//我猜原因是pictureBo裡的圖片被剪後就變成了被剪後的圖，是360*180的圖了不再是720*180，所以超出範圍了，不知道怎麼改才行就改成直接從資料夾匯入了</span>

<span style="font-family:Arial, Helvetica, sans-serif;">//如果依然用從pictureBox裡匯入的話改怎麼改，希望知道的朋友指導下
</span>
            RectangleF cloneRect = new RectangleF(180+X, 0, 360, 170);//從0+X處開始剪裁360*180的圖
            System.Drawing.Imaging.PixelFormat format =myBitmap.PixelFormat;//獲取myBitmap的PixelFormat，記為format
            //MessageBox.Show(X.ToString());//測試format符合要求
            Bitmap cloneBitmap = myBitmap.Clone(cloneRect, format);//複製cloneRect所表示矩形框內的圖，常提示記憶體不足
            this.pictureBox_map.SizeMode = PictureBoxSizeMode.CenterImage;//設定顯示模式
            this.pictureBox_map.Image = Image.FromHbitmap(cloneBitmap.GetHbitmap());
            //this.pictureBox_map.SizeMode = PictureBoxSizeMode.CenterImage;//設定顯示模式  
            myBitmap.Dispose();
            cloneBitmap.Dispose();
           
        }
 

 private void comboBox_SelectedIndexChanged(object sender, EventArgs e)//comboBox選擇時區時
        {
            label_tz.Text = comboBox.Text;//tab1頁面下顯示所選時區
            button_OK.Focus();
            for (i = 0; i < 49; i++)//找出所選timezone對應的offset
            {
                if (timezone[i] == comboBox.Text)
                {
                    s = offset[i];
                    int screenOffset = int.Parse(s);
                    int screenOffsetX = screenOffset / 4;
                   // MessageBox.Show(screenOffsetX.ToString());//檢測screenOffsetX的值是否和我手動計算的一致，可忽略
                    Clone_map(screenOffsetX);
                    break;
                }
            }
 

 //記錄時區名的陣列
        string[] timezone ={"(GMT -12:00) Eniwetok, Kwajalein","(GMT -11:00) Midway Island, Samoa",
"(GMT -10:00) Hawaii","(GMT -09:00) Alaska",
"(GMT -08:00) Pacific Time (US and Canada); Tijuana:","(GMT -07:00) Arizona",
"(GMT -07:00) Mountain Time (US and Canada)","(GMT -06:00) Central Time (US and Canada)",
"(GMT -06:00) Mexico City, Tegucigalp","(GMT -06:00) Saskatchewan",
"(GMT -05:00) Bogota, Lima","(GMT -05:00) Eastern Time (US and Canada)",
"(GMT -05:00) Indiana (East)","(GMT -04:00) Atlantic Time (Canada)",
"(GMT -04:00) Caracas, La Paz","(GMT -03:30) Newfoundland",
"(GMT -03:00) Brasilia","(GMT -03:00) Buenos Aires, Georgetown",
"(GMT -02:00) Mid-Atlantic","(GMT -01:00) Azores, Cape Verde Is.",
"(GMT +00:00) Greenwich Mean Time; Dublin, Edinburgh, London, Lisbon","(GMT +00:00) Monrovia, Casablanca",
"(GMT +01:00) Berlin, Stockhold, Rome, Bern, Brussels, Vienna","(GMT +01:00) Paris, Madrid, Amsterdam",
"(GMT +01:00) Prage, Warsaw, Budapest","(GMT +02:00) Athens, Helsinki, Istanbul",
"(GMT +02:00) Cairo","(GMT +02:00) Eastern Europe","(GMT +02:00) Harare, Pretoria",
"(GMT +02:00) Israel","(GMT +03:00) Baghdad, Kuwait, Nairobi, Riyadh",
"(GMT +03:00) Moscow, St. Petersburgh, Kazan, Volgograd","(GMT +03:00) Tehran",
"(GMT +04:00) Abu Dhabi, Muscat, Tbilisi","(GMT +04:30) Kabul",
"(GMT +05:00) Islamabad, Karachi, Ekaterinburg, Tashkent",
"(GMT +05:30) Bombay, Calcutta, Madras, New Delhi, Colombo","(GMT +06:00) Almaty, Dhaka",
"(GMT +07:00) Bangkok, Jakarta, Hanoi","(GMT +08:00) Beijing, Chongqing, Urumqi",
"(GMT +08:00) Hong Kong, Perth, Singapore, Taipei","(GMT +09:00) Tokyo, Osaka, Sapporo, Seoul, Yakutsk",
"(GMT +09:30) Adelaide","(GMT +09:30) Darwin","(GMT +10:00) Brisbane, Melbourne, Sydney",
"(GMT +10:00) Guam, Port Moresby, Vladivostok","(GMT +10:00) Hobart",
"(GMT +11:00) Magadan, Solomon Is., New Caledonia","(GMT +12:00) Fiji, Kamchatka, Marshall Is.",
"(GMT +12:00) Wellington, Auckland"};
        //記錄offset的陣列，即時間差，單位minutes
        string[] offset = {"-720","-660","-600","-540","-480","-420","-420","-360",
                           "-360","-360","-300","-300","-300","-240","-240","-210",
                           "-180","-180","-120","-060","+000","+000","+060","+060",
                           "+060","+120","+120","+120","+120","+120","+180","+180",
                           "+180","+240","+270","+300","+330","+360","+420","+480",
                           "+480","+540","+570","+570","+600","+600","+600","+660",
                           "+720","+720"
                          };
        int i;//用於記錄是第幾項
        string s;//用於記錄時區所對應的offset